Centrifugal pump



@en 2, H930 A. v, MUELLER CENTRIFUGAL PUMP 2 Sheets-Sheet l Filed Jan. 28, 1930 gwuwntoz mec. 2, w30.v A V, MUELLER www? CENTRIFUGAL PUMP Filed Jan, l28, 1930 2 sheets-sheet 2 Patented Dec. 2, 1930 UNITED STATES PATENT- OFFICE y .ALEXANDER V. MUELI'AER, OF-SALEM, OHIO, ASSIGNOR TO THE DEMING COMPANY., 0F i SALEM, OHIO, A CORPORATION OF OHIO vCENTRIIEU'GAL PUMP Application led January 28, 1930. Serial No. 423,960.

This invention relates to centrifugal pumps, and particularly to the features of priming the pump, draining it and establishing a water seal about the impeller shaft within the stuffing box.

In centrifugal pumps having an impeller on a drivingshaft and operating in a suitable chamber with an intake and a tangential discharge, it is'highlyl important to prime the pump, filling the chamber with water, to eX- clude air therefrom for starting, and it is important during operation to preventy leakage of air along the driving shaftto the impeller chamber. It is likewise important to have means for draining the impeller chamber. Such features have been heretofore provided, but it has beencustomary to make the priming and drainage ports in the impeller casing itself around the outer diameter of the impeller.

Now it is sometimes desirable to have the tangential discharge of the pump extend in one direction and sometimes another, as upwardly or diagonallyor horizontally, while it is essential that the priming passageway communicate with the top of the chamber and the drain at the bottom of the chamber. I propose to obtain a constant top entrance for the priming passageway and a constant bottom discharge, while all-owing the tangential discharge to be located in any desired position, by making the priming and draining passageways in the stationary head of the pump instead of in the impeller casing, such passageways terminating in ports in the pump head but communicating laterally with the impeller chamber outside of the impeller. With lsuch an ins-tallation, I can place the impeller casing in any selected position.

Moreover, by locating the priming port in the stationary pump casing, I can effect a.

.permanent connection between it and the mentioned.Y

e, more fully explained in connection with a preferred embodiment illustrated in the drawings, and its essential characteristics are i the plane indicated by the line 3-3 on Fig.

1; Figs. 4 and 5 are end views, on a reduced scale, of the pump, with the impeller casing in different positions.

As shown in Fig. 1, 1() designates the pump casing, 2O the impeller casing, and 30 the impeller mounted on a shaft 35, which has bearings carried by the pump casing. As shown thesebearings. comprise a sleeve 40, a packing 41 forced inwardly by a gland v42 clamped by nuts 43 on a pair of screws 44, and also a suitable ball bearing beyond t-he stuiiing box, designated generally 45.

The impeller comprises suitable blades indicatedat 31 mounted on a circular head 32 which has a-boss 33 occupied by a diametric pin 34 passing through the' shaft 33. The pump casing head 14 has a cylindrical recess 12 occupied by the impeller head 32 and an additional recess 13 occupied by the boss 33. In general however, the pump casing terminates in a vertical plane designated 15.

AThe impeller casing 2O has a dish-shaped intermediate portion 21, an annular iiange 23, a central outwardly extending hollow boss 24 and a tangentially arranged'discharge passageway 25 terminating in a socket 26. All of these parts are preferably made of one integral casting. The hollow boss 23 const`1 tutes the central intake passageway, being internally threaded for the reception of the intake pipe. The dish-shaped intermediate portions house a volute chamber 22 surrounding the impeller blades 31, and the discharge passageway 25 leads from this passageway tangentially. The discharge pipe 28 seats in the socket 26 of this discharge passageway.

In 'my pump, the priming passageway 50 is located in a boss 51 formed on the-back vertical `plane and is partly opposed by of the end plate 14 of the casing, this passageway being drilled or otherwise formed vertically into this boss. From thelower end of the passageway a horizontal passageway 52 leads to a vertical admission port 54 in the end plate 14. This port ends at the theimpeller casing, but' has its lower p0rtion discharging freely intothe upper portion of the volute chamber 22.

` Diametrically opposite 'the primin-g port 54, that is, in the lower portion of the end plate 14, is a draining port v which is Vertically located and is always in constant comi, municationgwith the impeller space 22. This porvtleads by a lateral passageway 61 to a discharge ventv 62 in a suitable boss 63 car- -ried on the back of the plate 14, this boss carrying a suitable pet cock 64 (Fig. 3) con- *trolling vthe discharge. f

It will be seen that the priming port 54 and the draining port 60 communicate with the impeller chamber irrespective of the position of the impeller casing. Fig. 4 shows the impeller casin with .the discharge pipe 28 vertical, while ig. 5 shows the same 1mpeller casing with the discharge `pipey extending at an. upward angle. The impeller bearing sleeve 40. This conduit may readilycomprise a' bent pipe joined by screw couplings 71 and 7 2 to nipples l73 and 74 screwed into the priming boss 51 yand the casing sleeve' 16 about the shaft bearing'40, 41. Bymaking thiswater seal lead from the priming chamber 50, it is entirely independent of the position of the.impeller casing Q k20, andz not disturbed ywhen thatv casing is i changed.

-- The 'primin .receptacle 50 in use is closed l screw p ug 58. The removal of this plug .enables the filling of the impeller chamber 2 2 Vand the water seal passagewa 70 with water to effect the priming and se 'l andl then the plug isl screwed into place. use the impelled water forces water'under pressure througbthe priming port 54`into the priming receptacle 50 and through the passagewa pressure a ut 4the shaft and thus establishing awater seal preventing leaka y of air along such shaft. My provision o priming mcafee? economically manufactured and enables the installation for testing of the water seal 'at they factory, irrespective of the'position which the impeller casing may occupy when the pump is installed.

. ll claim:

1. In a centrifugal pump, the combination of a pump casing, an impeller casing removably secured thereto and having an internal i chamber, a shaft in thepump casingtan `impeller 0n the shaft and located inthe 1mpeller casing, a priming passageway in the pump casing leading to a port in the pump casing communicating with the impeller chamber, a draining passageway -in the pumpy casing leading from a port in the pump casing communicating with the impeller chamber, and a conduit leading from the priming passageway to the bearing for the sha I2. In a "centrifugal pump, the combination of a'pump casing terminating in' a substantially vertical plane, a shaft mounted in said casing, an impeller o'nsaid shaft, an impeller casing having an int'ernal volute .chamber and a surrounding flange, said flange terminating in a substantially vertical yface and abutting the vertical plane of the pump casing, there being a central admission passageway and a tangential dlscharge lpassageway to and from the impeller chamy ber, means for holding the impeller casing in .various angular positions on the pump c asing, a downwardly, extending receptacle on the upper portion of the pump casing 1n communication with a port i-n the pump casing terminating at said vertical plane, a

tubular conduit-leading from said receptacle to the bearing for theshaft, a draining passageway located in the lower portion of the pump casing and terminating 1n`a portgat*v said vertical plane, the priming and d raining .ports being substantially iametrica'lly opposite each other and elongated 1n a vertical direction and overlapping the impeller chamber.,

ln testimony whereof, hereunto affix my signature. .Y

-, ALEXANDER V. MUELLER.

70 so as to keep water4 under and draining ports within the.V pump casing itself provides a construction which may be 

